I just wanted to sing the praises of this modest-looking but terrific tapas place on Sicilia, 180 in Eixample. This is the only place in Barcelona we revisited, partly because it was near our hotel, but also because the seafood is impeccable, the service is warm, and the array of food is appealing. Their fried fish is terrific, but I prefer the tender octopus above large potato rounds, the grilled razor clams, fried green peppers, grilled artichokes, jamon, and more. If you are lucky, they will be serving fresh snails, cockles, or crab. Try to sit in front of the tallish, balding gentleman. He has great humor and charm and will not steer you wrong. The wine is limited but delicious and all the usual liquors are at hand, too. We were always the only tourists in the place, and it is a wonderful respite from the hurlyburly of the Gothic area or the Gracia. We ate in the front, but there are tables with waiter service in the back.
Across the street is La Higuera (aka "The Fig Tree"), which serves excellent jamon. The street might be nondescript, but hte food isn't.